ARM: dts: am335x-wega: Fix audio codec by using simple-audio-card driver.

Sound did not work with the previous EVM sound card binding, EVM dts
switched to using 'simple-audio-card', so this fixes audio codec by using
simple-audio-card driver.

Signed-off-by: Steffen Hemer <s.hemer@phytec.de>
Message-Id: <20230214132302.39087-2-s.hemer@phytec.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>